Coupling device.



A. W. SCHH/UWM d E. B. WILFORD.

couPLmG DEVICE.

APPLICATION FILED JULY 28, 19H.

Patented Nov. 28, 1916.

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man sweaters reuen ADOLPH W. SCHRAMM, 0F RIVERTON, NEVJ J ERSEY, ANI)EDIFJARD B. WILFORD, 0F MERION, PENNSYLVANIA, ASSIGNORS TO ELECTROEENTAL MANUFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, ACORPORATION OF PENNSYL- VANIA.

COUPLING DEVICE.

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Application led July 28, 1,911.

These objects and other advantageous ends' are secured as hereinafterset forth, reference being had to the accompanying drawing, in whichFigure 1, is a vertical section illustrating the preferred constructionof our attaching head; Fig. @,is a horizontal section on the line ca-a., Fig. 1; Fig. 3, is a vertical sec tion on the line Z)-b, Fig. 1;and, Figs. 4 and 5 are perspective views, on an enlarged scale, ofcertain of the details of the structure shown in Figs. 1 and 3; Fig. 5including the co aerating parts of a hand piece'.

In the above drawings, 1 is a. part of a belt guiding joint on which ismounted a sleeve 2 'forming part of a casting 8 which has a tubularbearing il extending in a line at right angles to the line of saidpart 1. The casting as a whole is free to turn or swivel on the reducedend 5 of the part 1, upon which it is conined by a screw 6, althoughsuch turning is limited to something less than 3600 by means of aprojecting tooth 7 so iixed to the part 5 by said screw 6 as to strikesaid casting when it has turned to a predetermined extent.

Within the tubular portion 4': of the casting 3 is revolubly mounted asleeve 8 having an annular recess 11 in its external surface into whichprojects a locking plate or key 9 held by a screw 10 to the casting andextending through a suitable opening in the part 4l thereof into saidrecess. The outer end of this sleeve 8 is provided with a shoulder andenlarged portion 12 which is interiorly threaded for the reception of a.correspondingly threaded part of the hand piece; it being noted that ithas also an Specication of Letters Patent.

Patented Nov. 28, 1916.

Serial No. 640,978.

internal shoulder 13 for the reception of the flanged end of a secondsleeve 111 mounted within it. The construction of this latter sleeve iswell shown in Fig. l, from which it will be seen that its second end 20is somewhat reduced in diameter and has a. transverse slot 15 for thereception of the laterally projecting arms 17 on one end of a metallictongue or dog 18 (Fig. 5) designed to be mounted in this reduced end soas to project into the body portion, as indicated in Figs. 1 and 3.II'he laterally projecting arms 17 serve as trunnions for this tongue ordog, permitting it to swing within the sleeve 11i to a limited extent.

A screi' 19 is threaded into this slotted and reduced end 2O of thesleeve 14e and serves to clamp to said sleeve a driving pulley 21. Atthe same time the screw and part 2O are so designed that the former uponbeing set up, slightly spreads the two halves of said part formed by theslots therein, thereby causing them to iirmly grip the walls of theopening through the pulley 21. which it will be noted, abuts upon ashoulder 22 formed between the main portion of the sleeve 14 and thereduced end 20. At the same time this screw 19 serves to maintain thetongue or dog 18 in place with its body portion projecting into the mainpart of the sleeve 1e.

It will be noted that the casting 3 has a flange 23 bent or curved toextend partially over and guard the pulley 21 which is so mounted thatits plane is substantially coincident with or includes the axial line ofthe part Q of the wrist joint proper; said guard efl'ectually preventingcontact of the opera-tor with the pulley or cord thereon.

As shown in Fig. 5 the tongue or dog 18 is designed to be engaged by aslotted member 24 mounted on or forming part of a hand piece of anysuitable construction.

Under operating conditions a hand piece is coupled to the pulley 21 byhaving its properly threaded portion engaged by the threaded part of thesleeve 8 under which conditions the slotted member 24 which is attachedto and held from turning by the hand piece spindle, enters the sleeve111 and receives between its branches the dog or tongue 18. The slidingt between the member 24 and this dog or tongue, which swings on its arms17 in the slots 1.5, allows sufficient movement to provide for any lackof alinement between the spindles of the hand piece and wrist joint. Anyrevolution of the pulley is thus transmitted to the sleeve 14 and thencethrough the dog 18 to the hand piece.

By the use of the peculiar dog or tongue 18, a free driving action issecured between al dental hand piece spindle and the driving pulley 21regardless of how said parts are coupled by the sleeve 8, and thevarious parts are so arranged that they may not only be convenientlymade and assembled, but in addition their 'arrangement is -such that theliability of any of the parts getting out of order or requiringattention is reduced toa minimum.

1. A coupling consisting of a supporting structure; a tubular spindlerotatably mounted in said structure; and an independently movabledog'consisting of a flat plate having projecting trunnion arms adjacentone end and loosely mounted so as to lie wholly within said spindle;with a member removably fitting the spindle and capable of engaging saiddog.

A coupling consisting of a supporting structure; a tubular spindle linedin said structure but free to'turn therein; means for connecting adriven .member to the spindle including an oscillatory dog looselymounted within the same; a driving pulley onsaid spindle; and a singledevice connecting the pulley to the spindle and holding 'the dog inplace.

3. The combination of a supporting structure; a tubular spindle thereinslotted at one end; a driving pulley mounted on the slotted end of thespindle; and a screw engaging said end of the spindle to spread the samefor attaching it to the pulley; with a movable dog mounted in theslotted end of the Vspindle and retained therein `by said screw.

4. 'The combination of a supporting structure; two 4sleevesconcentrically mounted therein, the inner sleeve being longitudinallyslotted at one end and threaded; a pulley mounted on said slotted end;and a screw for altering the shape of said slotted end to cause it togrip the pulley; with a dog projecting into the inner sleeverand held inposition by said screw.

The combination of a supporting structure; a tubular spindle mounted insaid structure and longitudinally slotted at one end; an independentlymovable dog in the form of a substantially flat plate extending withinsaid spindle and having trunnions entering the slot thereof; means fordriving the spindle; means for retaining the dog in position; with amember formed to renter said spindle and transversely slotted at the endto receive said dog. Y

6. The combination of a tubular spindle; driving' means for saidspindle; a relatively short substantially flat plate having integraltrunnions projecting in its plane at opposite sides of one end andsuspended by said trunnions wholly within lthe spindle; with a memberformed to fit the spindle and capable of engaging the plate.

7. The combination or a sleeve having an internal shoulder and threadedinternally at one end a second sleeve iitting within the first sleevehaving a flange for engaging said shoulder' and transversely Vslotted atone end; a relatively short flat plate .having extensions adjacent oneend projecting into the slot of said second sleeve, the plate lyingwholly within said second sleeve; and Y means for preventing removal ofthe plate Vfrom the second sleeve; with means for transmitting power toor from said second sleeve.

In testimony whereof we have signed our names to this specilication, inthe presence of two subscribing witnesses.

DOLPH W. SCHRAMM. EDY/IARD B. l/VILFORD.

Witnesses:

VILLIAM E. BRADLEY, WVM. A. BARR.

Copies of this patent may be obtained for five cents each, by addressingthe fcommissioner oi Patents.,

Washington, D. C.

